Sketchup to Blender - Material not visible
You can install the add-on called Blendup. There are two versions: free and paid ($35). The free version is limited to SketchUp models with less than 1000 faces.

Just install the add-on. Select your model in File> Blendup, select the settings you need and click export. Then open the blend file which you have exported from Sketchup and switch to Material or Render mode and you will see your material.

For more details watch this video